Callaway Golf Diablo Octane Rangefinder by Nikon Capable of measuring distances to targets in succession for up to 8 seconds by pressing just one button Superior Nikon Optics for crisp, clear images. Durable design is fully waterproof and fogproof. First Target Priority targets the pin, bunker, or closer objects even with trees in the background. New, thin turbostratic case for in-round use and walker clip design Focusing diopter by simple twisting action on the eyepiece